Log Message:
gnupg2: updated to 2.2.15

Noteworthy changes in version 2.2.15:
* sm: Fix --logger-fd and --status-fd on Windows for non-standard
  file descriptors.
* sm: Allow decryption even if expired keys are configured.
* agent: Change command KEYINFO to print ssh fingerprints with other
  hash algos.
* dirmngr: Fix build problems on Solaris due to the use of reserved
  symbol names.
* wkd: New commands --print-wkd-hash and --print-wkd-url for
  gpg-wks-client.